According to the information you provided, the novels with the main character being the reincarnation of the Sage include Dao Seal and Tianmang Transformation.
In " Seal of Dao," the main character Jiang Xiaofan was a mortal who accidentally obtained a fragment of the seal. He cultivated the Wugu Sutra of Buddhism and Taoism, traveled in the Ziwei River, crossed the Milky Way, and was invincible under the starry sky. He proved the supreme Great Dao with his own body. He was the reincarnation of one of the nine heavens, the Sage.
In " Tianmang Transformation," the main character, Jiang Fan, was also the reincarnation of Shengtian. The novel told the story of Jiang Fan transmigrating to the Primordial World and becoming one of the Nine Sons of the Heavenly Dao, Shengtian. He fought fiercely with the other eight emperors.
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Well, it depends on the specific fanfic. Some fanfics do portray Naruto as the reincarnation of the Sage. This concept can be used to explore different plotlines. For example, it might explain some of his unique abilities that seem to come out of nowhere in the original story. It also allows the author to create new relationships and power dynamics within the Naruto universe.
The plot of such a fanfiction might start with Naruto experiencing strange visions or dreams related to the Sage. As he investigates, he realizes his reincarnated status. Then, it could be that he has to learn to control the Sage's powers, which are far beyond what he has known before. This could lead to him having to re - evaluate his own ninja way. His friends might be initially skeptical but then come to support him. There could also be antagonists who either want to use Naruto's newfound connection to the Sage for their own evil purposes or who are afraid of the power he might gain and try to stop him from fully realizing his potential as the reincarnation of the Sage.
Naruto is surely one of the main characters since it's about his reincarnation. And there would likely be his friends like Sasuke and Sakura. Also, characters related to the Sage of Six Paths might play important roles, either as allies or antagonists.
It could be a new character entirely. Maybe a young ninja who discovers they are the reincarnation. This would give the writer a lot of freedom to develop the character's growth and personality as they come to terms with their new identity.
In some fanfictions, the reincarnation might lead to a different kind of bond between the main character and the tailed beasts. For example, they could communicate on a deeper level and share knowledge that was lost in the past. This could change the power dynamics in battles and how the character progresses in the story.
One interesting plot idea could be exploring how the reincarnation affects the balance of power in the Naruto world. Maybe the reincarnated character has unique abilities that disrupt the existing order among the ninja villages.
In this kind of fanfiction, the very fabric of the Naruto universe might be altered in terms of relationships. The reincarnated character could have a different perspective on things like the Uchiha - Senju conflict. They might try to resolve it in a new way, or their presence could even make the conflict more complex as different factions react to their existence and power.
The following are a few recommended immortal cultivation novels about reincarnation:
1. " Asking for Questions ": The author is a plagiarist. It tells the story of the protagonist's rebirth and transmigration. By avoiding the difficulties of his previous life, he develops his own strength and takes revenge on his enemies. This novel was meticulously set up, and the plot and character settings were excellent.
2. " Immortal Cultivation: I Can Reincarnate ": A Xianxia novel written by an unfinished cat, which tells the story of Wang Zhixin's accidental rebirth into the world of immortal cultivation. When he was unable to break through to the Golden Core realm due to his talent, he discovered that he had actually been reborn when he was at the end of his life.
3. " Life of Reincarnation and Immortal Cultivation ": A Xianxia novel written by the author Ouyang Ye. It tells the story of the protagonist falling at the end of his life time and time again, reincarnating again and again, and passing on the story of Xin Huo. Every time he reincarnated, he would do his best to condense his talent, refine a flying ship, leave behind an inheritance, condense his life's work, and fight for the immortal fate of the next life.
Please note that the recommended novels above may only be a part of the list. There are other similar immortal cultivation novels to choose from.